Grundfos TPE2 - Page 81

System application Select this control mode
In systems with relatively small pressure losses in the distribution pipes.
• Two-pipe heating systems with thermostatic valves and the following:
- sized for natural circulation
- small pressure losses in those parts of the system through which the
total quantity of water flows, for example boiler, heat exchanger and
distribution pipe up to the first branching or modified to a high
differential temperature between flow pipe and return pipe, for example
district heating.
• Underfloor heating systems with thermostatic valves.
• One-pipe heating systems with thermostatic valves or balancing valves.
• Primary circuit pumps in systems with small pressure losses in the primary
circuit.
Constant differential pressure
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In systems with a fixed system characteristic.
Examples
• one-pipe heating systems
• boiler shunts
• systems with three-way valves
• domestic hot-water circulation.
You can use FLOWLIMIT with advantage to control the maximum circulation
flow.
Constant temperature and
constant differential
temperature
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If an external controller is installed, the pump is able to change from one
constant curve to another, depending on the external signal.
You can also set the pump to operate according to the maximum or minimum
curve, like an uncontrolled pump:
• Use the maximum-curve mode in periods in which a maximum flow is
required.
This operating mode is for instance suitable for hot-water priority.
• Use the minimum-curve mode in periods in which a minimum flow is
required.
This operating mode is for instance suitable for manual night setback if you
do not want automatic night setback.
Constant curve
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